JP3424705B2 - Stand-to-stand looper with shape sensor roll - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-stand looper provided with a shape sensor roll for measuring the tension distribution in the width direction of a strip.

[0002]

2. Description of the Related Art It is extremely important in terms of product quality to make the shape of rolled material (strip) rolled by a rolling mill uniform. However, since the shape change of the strip during rolling cannot be visually determined, in order to detect the shape of the strip, as shown in FIG. A shape sensor roll 12 'that measures the distribution and grasps the shape of the strip has been created and has already been implemented in part (for example, "Plasticity and processing" Vol. 20, No. 217, 1979, "Shape detection device"). Jikkou 3-11691, "Shape Detector" Jikkou 3
-11692, etc.).

FIG. 4 is a sectional view of the shape sensor roll disclosed in Japanese Utility Model Publication No. 3-11691, which shows a cylindrical fixed shaft 2, an axially divided outer ring 3, and a supply provided on the fixed shaft. It is composed of a fluid circulation device for circulating a pressure fluid to the mouth and the discharge port, a displacement detection device 5 for detecting the displacement of the outer ring, etc., and measures the widthwise tension distribution of the strip being rolled from the displacement signal of the outer ring 3. It is like this. Further, the shape sensor roll of Japanese Utility Model Publication No. 3-11692 uses a rotating shaft instead of a fixed shaft, and embeds a load sensor on the outer peripheral surface of the shaft so as to correspond to the rotor divided in the axial direction. The tension distribution in the width direction is measured from the detected force.

On the other hand, the inter-stand looper is installed between a plurality of hot rolling mills 6 (stands) as shown in FIG. 3, and the rollers 7 are swung to adjust the tension of the strip 1 between the stands. It is used to A pre-rotation device 8 (helper), which is a type of water turbine, may be provided at the end of the roller 7 used for the inter-stand looper, as schematically shown in FIG. With this device, the rotation speed of the roller 7 is made substantially equal to the traveling speed of the strip 1 in advance, scratches on the strip are prevented, and seizure of the roller 7 is prevented.

[0005]

The above-described inter-stand looper and the shape sensor roll 12 'have conventionally been installed separately on the rolling line, but there is a problem that the rolling line becomes long. Therefore, conventionally, a looper between stands provided with a shape sensor roll instead of a roller has been demanded.

However, as is apparent from the shape sensor roll illustrated in FIG. 4, the shape sensor roll needs to take out fluid and a large number of electric signals from the rotating roll. Since the slip ring is indispensable, there is a problem that the rolling resistance of the roll is large. Therefore, even if the shape sensor roll is simply replaced with the roller 7 of the conventional inter-stand looper, the shape sensor roll cannot be rotated by the conventional pre-rotating device 8 (helper), and the leading end portion of the strip 1 enters. At the time of (before the strip is tensioned between the stands), the leading edge of the strip comes into contact with the stopped roll, causing a lot of accidents such as scratching the strip or burning on the roll side. was there.

The present invention was created to solve such problems. That is, an object of the present invention is to provide a shape sensor roll with large rotation resistance, and it is possible to rotate the shape sensor roll at a desired high speed,
Accordingly, it is an object of the present invention to provide an inter-stand looper including a shape sensor roll capable of preventing the occurrence of scratches on the strip and the seizure of the sensor roll.

[0008]

According to the present invention, in a tandem rolling mill, a shape sensor roll for measuring the widthwise tension distribution of the strip and a pre-rotating device for rotating the shape sensor roll by hydraulic pressure are provided. Prepare for the preliminary
The water turbine of the rolling device has a plurality of turbines arranged at intervals in the circumferential direction.
Has a bucket and is fixed at one end of the shape sensor roll
An impeller, a casing surrounding the impeller, and the casing
It consists of multiple nozzles for water injection fixed to the
The bucket receives the dynamic pressure of the jet from the nozzle directly
Spherical recess located almost perpendicular to the jet
And a slant for escaping the jet flow colliding with the recess in the axial direction.
And a plurality of nozzles corresponding to each other.
The buckets that are
An inter-stand looper having a shape sensor roll is provided.

According to a preferred embodiment of the present invention, the casing is open at least at the lower side so that the jet flow after driving the impeller does not hinder the rotation of the impeller.

[0010]

According to the above-described structure of the present invention, a plurality of buckets arranged at intervals in the circumferential direction are arranged substantially orthogonal to the jet so as to directly receive the dynamic pressure of the jet from the nozzle. Since it has a spherical spherical concave portion and an oblique escape groove for axially escaping the jet flow colliding with the concave portion, a large rotational torque is generated in the impeller by receiving the dynamic pressure of the jet flow in the concave portion. Further, the jet flow is axially released from the oblique escape groove, so that the water retained in the casing can be smoothly separated from the impeller, and the torque loss due to the agitation of the water in the casing can be minimized. Further, by arranging a plurality of nozzles in the corresponding buckets with the phases shifted in the circumferential direction, it is possible to smooth the torque fluctuation generated by a single nozzle by the phase shift.

Therefore, such a water turbine can generate a large rotational torque with little fluctuation, and the shape sensor roll having a large rotational resistance can be rotated at a desired high speed rotation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. In the drawings, common parts are designated by the same reference numerals and used. FIG. 1 (A) is an overall configuration diagram of an inter-stand looper equipped with a shape sensor roll according to the present invention, and FIG. 1 (B) is a configuration diagram of a water turbine attached to one end of the shape sensor roll. Figure 1
As shown in (A), the inter-stand looper 10 of the present invention.
Is installed between a plurality of hot rolling mills 6 (stands),
It is used to rock the shape sensor roll 12 to eliminate slack in the strip 1 between stands. The shape sensor roll 12 measures the tension distribution in the width direction of the strip 1, and the conventional shape sensor roll described above can be applied as it is.

The inter-stand looper 10 of the present invention further comprises a water wheel 14 for rotating the shape sensor roll 12 by water pressure. As shown in FIG. 1B, the water turbine 14 includes an impeller 16 fixed to one end of the shape sensor roll 12, a casing 18 surrounding the impeller 16, and a plurality of water injection nozzles fixed to the casing 18. And 20. Further, the impeller 16 has a plurality of buckets 15 arranged at intervals in the circumferential direction. The number of buckets 15 is 16 in this embodiment, but the present invention is not limited to this, and it is desirable that the number of buckets 15 is large in a range where the flow of the jet flow can be made smooth, and it is preferable that the number is 10 or more.

FIG. 2A is a side view of the impeller 16, and FIG. 2B is an enlarged view of the bucket 15. As shown in FIG. 2, each bucket 15 has a spherical concave portion 15a arranged substantially orthogonal to the jet flow so as to directly receive the dynamic pressure of the jet flow from the nozzle, and the jet flow colliding with the concave portion 15a as an axis. It has an oblique escape groove 15b for allowing it to escape in the direction. With such a configuration, a large rotational torque can be generated in the impeller 16 by receiving the dynamic pressure of the jet flow in the recess 15a, and the jet flow is axially released from the oblique escape groove 15b, whereby the water retained in the casing 18 is retained. Can be smoothly separated from the impeller, and torque loss due to agitation of water in the casing can be minimized.

Further, as shown in FIG. 1 (B), a plurality of (two in this figure) nozzles 20 are arranged with their phases shifted in the circumferential direction with respect to the corresponding buckets 15. That is, in this embodiment, the plurality of buckets 15
Are spaced apart from each other by an angle of 22.5 °,
The two nozzles 20 are arranged such that when one nozzle is orthogonal to the corresponding recessed portion 15a of the bucket 15, the other nozzle is deviated from that position by an angle of 11.25 °. With this configuration, the torque fluctuation generated by a single nozzle can be smoothed by the phase shift.

Further, as shown in FIG. 1 (B), the casing 18 has a small radial and axial spacing in order to effectively utilize the jet flow after collision. Further, at least the lower part is opened so that the jet flow after driving the impeller does not hinder the rotation of the impeller. With such a configuration, the jet flow received by the bucket can be effectively used, the water accumulated in the casing can be smoothly separated from the impeller 16, and the torque loss due to the stirring of the water in the casing can be minimized.

Table 1 is a summary of the test results of the shape sensor roll provided with the above-mentioned water turbine. As shown in this table, in the conventional water turbine shown in FIG. 5, the shape sensor roll did not rotate at all, and in the well-known Pelton turbine having no oblique clearance groove, it rotated, but only at a speed of about 4 rpm.
On the other hand, in the water turbine of the present invention, the high speed rotation of about 20 to 30 rpm required for synchronization with the strip 1 could be achieved. That is, it was confirmed that the above-described water turbine can generate a large rotational torque with little fluctuation, and can rotate the shape sensor roll having a large rotational resistance at a desired high-speed rotation.

[0018]

[Table 1]

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0020]

As described above, the inter-stand looper provided with the shape sensor roll of the present invention is provided with the shape sensor roll having large rotation resistance, and the shape sensor roll can be rotated at a desired high speed. This has an excellent effect such that the occurrence of scratches on the strip and the seizure of the sensor roll can be prevented.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram (A) of a looper between stands according to the present invention and a configuration diagram (B) of a water turbine attached to one end of a shape sensor roll.

FIG. 2 is a side view (A) of an impeller and an enlarged view (B) of a bucket attached thereto.

FIG. 3 is a schematic view showing a usage state of the shape sensor roll.

FIG. 4 is an example of a cross-sectional view of a shape sensor roll.

FIG. 5 is a schematic view of a conventional water turbine.

[Explanation of symbols]

1 strip 2 fixed axis 3 outer ring 5 Displacement detection device 6 Hot rolling mill (stand) 7 Laura 8 Pre-rotation device (helper) Looper between 10 stands 12 Shape sensor roll 14 turbine 15 buckets 16 impeller 18 casing 20 nozzles

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-42950 (JP, A) JP-A-63-160703 (JP, A) JP-A-3-81010 (JP, A) Actual Kaihei 5- 24102 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21B 39/08 B21B 37/00 B21C 47/34 F03B 1/02 F03B 1/04 F03B 3/18

Claims (2)

(57) [Claims] 1. A tandem rolling mill is provided with a shape sensor roll for measuring a widthwise tension distribution of a strip, and a pre-rotating device for rotating the shape sensor roll by hydraulic pressure . Circumferentially spaced
The shape sensor roll has a plurality of buckets
Fixed impeller, a casing surrounding the impeller, and the casing
A plurality of water jet nozzles fixed to the housing
Each bucket receives the dynamic pressure of the jet flow from the nozzle directly.
As shown in Fig.
A concave portion and a jet for axially escaping the jet flow colliding with the concave portion.
An oblique clearance groove, and the plurality of nozzles are respectively
For the corresponding bucket, distribute the phase in the circumferential direction.
The shape sensor roll is characterized by being placed
Looper between stands with. 2. The shape sensor roll according to claim 1, wherein at least a lower portion of the casing is opened so that a jet flow after driving the impeller does not hinder the rotation of the impeller. Looper between stands with.